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Old 02-22-2013, 12:52 PM   #1
allred27
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Default LIM Gasket

Hey guys, I'm plan on replacing the LIM Gasket. on my parents '97 3.1L v6

My question is what else should I replace since I'll be in there?

I'm going to replace the:
Water pump
Radiator Cap

anything else I'm missing?

I'm ordering the gasket kit, water pump & radiator cap from rockauto
thanks
Aaron
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Old 02-22-2013, 05:59 PM   #2
RonNVA
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Default Re: LIM Gasket

I did this recently on my '98 3.1L V6. You definitely want to replace the thermostat, since it is a real bear to get to without removing some of the parts that will be removed during the LIM replacement. Also,there is an O-ring seal that goes to the oil pump shaft that sits near the valley on the driver side of the engine. This is real easy to get to with the LIM removed. The gasket kit that I purchased included this gasket, so I used it.

Also, I would check all of the hoses and the serpentine belt. You're going to be removing/disconnecting these anyway, and it might make sense to replace them while you are there. When I pulled the fuel injectors/fuel rail out of its seat, several of the O-rings were in pretty bad shape. I had purchased replacement O-rings before I started this job, and I was glad I did. Otherwise, I would have had several down days waiting for these pieces to be delivered.

You should probably also have the gaskets for the EGR valve and the throttle body. Also, there is an O-ring that might get lost if you disconnect the fuel rail from the fuels lines. Some on the forum have just set/tied the fuel rail out of the way during this work to avoid breaking the fuel line connection.

There are quite a few posts on this job on this forum and on the web, that were extremely helpful when I was considering this job. Feel free to PM me if you have any questions. Good luck.

Ron
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Old 02-24-2013, 08:24 AM   #3
allred27
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Default Re: LIM Gasket

thanks Ron... I ordered all the misc seals, therm. & serpt belt
now the fun begins
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Old 02-24-2013, 07:04 PM   #4
Rodents
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Default Re: LIM Gasket

No need to disconnect the fuel lines, just take the bolts out of the lower intake that hold the injectors in the plenum and on the drivers side of the engine you'll see a single bolt holding the lines at the engine, remove that bolt and swing the rail to the side. Don't disconnect more than you need to. There's a water pump bypass seal (oring), a heater pipe seal coming in by the thermostat area. Intake and exhaust pushrods are different length, don't mix them up! Exhaust rod is longer. Make sure the pipe running along the lower plenum isn't corroded where it enters the plenum on the side by the t-stat. If it is, replace it. If the head or plenum suface is deeply pitted, consider an appropriate epoxy or method to fill in the deep pit marks. This happens at the coolant ports only.
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Old 02-26-2013, 01:09 PM   #5
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Default Re: LIM Gasket

thanks for the tip's. I'll make sure not to disconnect the fuel lines. Would you still have to relieve the fuel pressure since I wont be disconnecting the fuel lines?
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Old 02-26-2013, 04:11 PM   #6
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Default Re: LIM Gasket

If you disconnect any fuel line that is pressurized then you'll need to depressurize the fuel lines to keep from spraying fuel all over the place. Real simple.
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Old 02-26-2013, 06:40 PM   #7
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Default Re: LIM Gasket

Yeah, just to be safe. I don't and I know that I'm risking an injury sometimes but the clock is not your friend in warranty work. Pull the fuel pump relay with the engine running, the engine will shut off, then crank it for maybe 10 seconds and fuel pressure will be very low or nonexistent. Don't forget to put the relay back in after you are done. Leave it out until you are done.
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Old 03-04-2013, 09:56 AM   #8
allred27
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Default Re: LIM Gasket

thanks for you help guys..

Another tip for someone doing this job...

One bolt on the rear valve cover gasket is blocked by a stud from the coil pack, use a 8mm or 5/16 wrench dont try to use a socket otherwise you will strip the head of the bolt.
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Old 03-04-2013, 11:46 AM   #9
RonNVA
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Default Re: LIM Gasket

Are you talking about the stud that sticks up from the engine and connects to the corner of the coil pack mounting plate? I recall seeing somewhere that this stud could be removed, so when I did mine I took a good look at it and figured out that the stud was threaded on both ends. I was able to easily back the stud out of its position and then install the rear valve cover without any clearance issues.

You are correct, with the stud in the way it would be difficult to reach that one valve cover bolt.
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Old 03-04-2013, 04:58 PM   #10
allred27
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Default Re: LIM Gasket

Yeah that's the stud I was talking about. I wasn't able to back mine out, it decided it wanted to stay...the head of the stud stripped really easy
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